Pressure jojokr



G. A. KNAAK.

PRESSURE MEMBER.

APPLICATION FILED APR. 9, 1919.

1,385,378. Paterited July 26,1921.

GEORGE KNAAK, OF MILWAUKEE, WISCONSIN.

PRESSURE MEMBER.

Specification of Letters Patent.

Application filed April 9. 1919. Serial No. 288,850.

To all whom it may concern Be it known that I, Gronen A. KNAAK, acitizen of the United States, residing at Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented certaln new and usefulImprovements in Pressure Members, of which the following is aspecification, reference being hadto the accompanying drawing, formingapart thereof.

This invention relates to pressure members and the object of theinvention is to im; prove the construction of pressure members in themanner to be hereinafter described and claimed. I

Referring to the drawings which accompany this specification and form apart hereof, which drawings illustrate an embodiment of this invention,and on which drawings the same reference characters are used todesignate the same parts wherever they may ap pear in each of the views,Figure 1 1s anelevation of the pressure member looking in the directionof the arrow on Fig. 2, parts being shown in section and parts beingshown as broken away; and Fig. 2 is a vertical section, taken on theline 2-2 on Fig. 1, looking in the direction indicated by the arrows. 1

Referring "to the drawings, the reference numerals 1 and 2 designate thetwo sides of a pressure member box 3. The sides 1 and 2 are made fromany suitable metal and are provided with corrugations as clearly shownby Fig. 2 of the drawings. Preferably the corrugations areconcentrically arranged in the well-known manner and the sides 1 and 2are provided with flanges 4 and 5. Heretofore it has been customary tosolder the flanges 4 and 5 together and rely upon the corrugations togive the sides of the box flexibility so that the sides could bulge outand in with variations of pressure. The result, however, has been thatmore or less of the movement of the sides has been transmitted to andtaken place at the edges 6 and '7 where the sides are turned to form theflanges 4 and 5 and the continued bendin of the metal at these edges hasresult in breakage. The principalobject of this invention is to dispensewith an edge which can be subjected to bending movements. I accomplishthis result by holding the sides land 2 in such a manner that all of themovements of the sides must be confined within the sides themselves.

In the construction illustrated by the drawings, the ordinary flanges 4and 5 are shown united by solder 8 and clamp mem- 'member 11 between thetwo sides of the box against which the two sides can be firmly secured.The clamp members 9 and 10 may be/secured in any suitable manner as, forexample, by bolts 12 and should have curved Patented July 26, 1921.

or flaring surfaces 13 and 14 so that the sides will not have to bendover sharp edges. The sides of the box are substantially tangent to thecurved surfaces 13 and 14 of the clamp members 9 and 10, when the box isnot bulged outwardly,-and, as the sides of the box are bulged outwardlytions of substantial tangency with more remote parts of the curvedsurfaces of the clamp members. The result is that the metal of the sidesis constrained to move in predetermined elongated arcs and ,pinchpoints, or sharp bends are obviated.

The box 3 is illustrated as provided with twoapertures into one of whichprojects a nipple 15 and into the other of which proects a stud 16. Thenipple 15 is provided with a bore 17 and isillustrated as secured 1n aboss 18 to which a pipe ma be connected to permit .fluid entering thebox 3. Pressure plates 19 arid 20 are assembled upon thenipple 1.5 andthe stud 16 to back the sides 1 and 2 and to provide for uniform bulgingof the box 3 and spacing washers 21 and 22 are inter osed between thepressure plates and the si es 1 and 2. Nuts 23 and 24 screwed upon thereduced, screw threaded ends of the nipple 15 and the stud 16 hold theparts firmlyto ether and solder is preferably used to mal e the jointstight. The reference numeral 25 designates a lever to which the pressuremember can transmit its movements to perform some desired work and thislever is mounted in a case 26 which 1s provided 'with a removable cover27 to which the pressure member is secured. This construction makes the'stud 16 a floating member which can move away from or toward the nip le15 as the pressure varies in the box 3. t will be understood that thelever 25 is acted upon by some resistance as a spring, not shown, whichtends to press the arm 28 of the lever against the stud 16.

It will be readily understood that in assembling thepressure member, thesides 1 they assume new posi and 2, the pressure plates 19 and 20,

as spacing washers 21 and 22 and the nuts 23 and 24 are first assembledwith the nipple 15 and the stud 16 and the joints are solderedr Thebearing member 11 'is then placed between the sides 1 and 2 andthesolder 8 applied to make a tight joint. The

against said bearing member, said clamp member being provided with a.curved surface and the side being substantially tangent to said curvedsurface and adapted to bend over the same to more remote points ofsubstantial tangency- I 2. The combination in a pressure member, of abearing member, two corrugatedmetal sides, clamping members to clampsaid sides against said bearing member, said clamp ing members beingprovided with curved surfaces and the sides being substantially tangentto said curved surfaces and adapted to bend over the same to more remotepoints of substantial tangency.

3. The combination in a pressure member, of a nipple, a stud, pressureplates secured thereto, a-box composed of corrugated metal sidesprovided with flanges secured to the nipple and to the stud, a rigidbearing member inside the; box adjacent said flanges, and

clamping members to clamp said sides against said bearing member andprovided with curved surfaces, the sides being substantially tangent tosaid curved surfaces and adapted to bend over the same to more remotepoints of substantial tangency.

4. The combination in a pressure member, of a bearing member, ayield-able metal side,

against said bearing member, said clamp member being provided with acurved surface and the side belng substantially tangent 'to said curvedsurface and adapted to bend GEORGE A. KNAAK.

and a clamp member to clamp said side

